feat: The number of replicas button is change to "+" and "-"

Created by: xuliwenwenwen

Signed-off-by: xuliwenwenwen liwenxu@yunify.com

What type of PR is this?

What this PR does / why we need it:

/kind feature

Which issue(s) this PR fixes:

Fixes ##2135 (closed)

Special notes for reviewers:

None

Additional documentation, usage docs, etc.: